brother of Sigimer and uncle of Arminius the Cheruscan [ARMINIUS]. Inguiomerus had been the adherent of Rome, but afterwards joined his nephew and his own tribe, and narrowly escaped with his life, when the Cheruscans, owing in great measure to his advice, were in A. D. 16 defeated by the Romans under Germanicus on the plain of Idistavisus, between the Visurgis (Weser) and the neighbouring highlands.
In the following year, envy of the fame or power of Arminius again detached Inguiomerus from the Cheruscans.
At the head of his own clients he deserted to Maroboduus, king of the Suevians, with whom he was defeated by Arminius. (Tac. Ann. 1.60